Pulley assembly



O. MITCHELL PULLEY ASSEMBLY Feb. 6, 1940.

. Filed May 1, 1939 UNITED STATES earner l 20 tained.

Patented ab. v6, 1940l f 2,188,91531'., f

' `2,188,953 PULLEY ASSEMBLY Orville Mitcheu, Dallas, Tex. Application May 1, .1939, SerialvNo. 271,022

11 claims..v (01; 'M -'nea This invention has for its general object to protaining said circular opening against the `shoulder vide anovel V-belt pulley assembly which will' oi the hub. v

. enable different sizes of vpulleys to be ,readily v The principal idea of my invention is capablel mounted on hubs having `bores of -a` desired diamof beingembodied in various forms as tothe shape eter. of the hub, and various ways of securing the 5t", y

`As is well known, V-belt pulleys are used in pulley on the hub may be employed, illustrative. l great variety, the usual diameter varying from' embodiments of which are shown by the accomfour to sixteen inches, andI the bores ordinarily panying drawing, in which Fig. l is a View in l ranging from onehalf to one and seven-sixteenthl elevation of the 'outer or rear side of a pulley conl inches'. In yorder to have on hand `a complete structed according to my invention and mounted 10i?` stock involving all the possiblecombinations of on a shaft, the latter being shcwn'in section; diameter-and bores, a jobber, or other dealer, is a similar view of the front side of said Would-have to keep on hand a large variety of pulley; Fig; 3 is a cross-section on-the line 3-3 pulleys, possibly more than two hundred different" oi Fig. l; Fig. i is a cross-section on an enlarged l5 kinds. To meet' this situation, pulley manufacscale on the line lined of Fig. l, showing one means 155- turers make their pulleys and hubs separate and of securing the pulleyl on the hub; Fig. 5 is a ;f use various methods for securing them. together, `view in side elevation of 'the hub shown in Fig..4' u upon receipt lof an order, whereby the requiredK before its connection to the pulley; Fig. 6 isa' combination of diameter andbore may be obview similar to Fig. 4, showing a modification in the means of securing the pulley on the hub; ,2O- v My invention relates to a novel construction Eig. Tis a View in side elevation of thehub shown of hub and pulley, which will enable the dealer in `lig. 6'; Fig. 8 is a view similar to Fig. 2l showing to rapidly assemble and permanently secure any the central portion only of a pulley, and illustratu l given'size of pulley on a hub having the required ing a modified form of the hub;Fig. 9 is a crcsssize of bore, the act ofuassembling the hub and sectionv on an enlarged scale on the line @-9 of 25k pulley automatically establishing a driving rela- Fig. 8; and Fig. 10 is a view in side elevation oi tionship between the two` I i the hub shown nFig. 9;

My invention is characterized bythe provision Referring nowl to the drawing, the numeral I,I v, of'a pulley having through a part of vits thickness in all of the assembled views, indicates a shaft a central opening oione diameter and through having a key-way 2 and on whicha pulley 3 is 30.1.1

the balance of 'its thicknessy a central opening adaptedto be secured by means of a keyv l inof a smaller diameter, a hub inserted in said serted in said key-way and inasimilar key-way' pulley having two corresponding cross-sectional provided in either form of the hub to be described.

' diameters providing a shoulder' for abutting The pulley 3 consists of two'flanged discs li and 'lv against that portion-of the pulley having the secured'together, preie'rablyby spot-Welding at 35,5

smaller opening, one of said openings and the the two lcirculan" series of points indicated by 8, portion of the hub mounted Itherein having nonand suitably shaped, when united, to form a V-4 circular engaging surfaces to effect a driving rela-` groove, 3a. Eachoi these discs has weldedy toit tionship 4between the hub and the pulley, and a re-inforcing plate, il, lil, respectively',being spot- 40v means' for securing the pulleyagainst the `weldedthereto atthecircular series. of points in-ffiO'rv shoulder. dicated by ll. lEach of the plates il, lit is pro-" vlnits preferred embodimenamy improved pulvided near its periphery with a circular' series of ley consists of a hub of one diameter having openings l2 to permit the discs t and l to be a non-circular portion and a circular portion of spot-welded through them' at the inner series of smaller diameter projecting lfromone side of the pointsii, as clearly shown inliigs. l and 2. 45.2

hub and affording a surrounding shoulder", anda The preferred shapeof `the hub I prefer to pulley provided with a non-circular opening for employ is hexagonal, as shown in Figs.` 2 and 5, va 'portion of its thickness to receive and engage and indicated bythe numeral 13. This hub is over thelnon-circular portion of the hub and a made from bar-stock, bored out toA t the shaft circular opening extending `through the remainon which it istoA-be mounted, vand usually pro- EiOf` ing thickness of the hub and` receiving the circular vided With a key-way E5, as stated above.` The projecting portion of the hub, the end of the outside of the hub is turned down for a part of projecting portion being spun or crimped against its length to a round cross-section, as indicated the face lofgthe pulley surrounding said circular at 4l in Fig. 5.' The hexagonal, 'or other non- :opening tof'clamp the portion ofthe pulley concircular portion, and th570TCUla-I DOYtOn 0f the hub, each serves its own function,v as will bedescribed later. i

Each of the discs t and 'l is provided with ya i hole in its central portion. to accommodate the hub. The hole in the front discy t is hexagonal to snugly receive the hexagonal` portion of the hub, and the hole in the rear disc 'I is circular,

v to receive the round portion M of the hub. Plates 'Sand Iii have correspondingly shaped holes, as

will be understood. The round portion I of the hub is adapted to protrude past the rear disc and plate for a distance of about one-fourth of an inch, and provides the means for clamping the l rear disc l against the shoulder I of the hexagonal portion of the hub.

In assembling the disc and hub, the circular l portion Iii is passed through the center of the iso.;

355y and 9.

pulley, that is through thecircular hole in the f disc 'I and plate Iii, and the'hexagonal portion 'I3 is inserted in the hexagonal opening oi disc and plate 9, with its shoulder` I5 lying flush' against the inner side of disc l, all as clearly shown in Fig. 4. rljhe pulley may be secured on the hub in any one of several Ways, but preferably, and as indicated in Figs. 3, and Q, by crimp-ing or clinching the protruding portion lll against the rear face of the pulley. To this end, the circular projection Mis turned down so that the thickness k of its wall surrounding the bore of the hub is about one-sixteenth of an inch, and after thediscs 6 and 'I with their re-enforcing plates are inserted on it, a spinning-tool is applied under pressure to itsprojecting. end and the material of the projection bent back against the face of the reenforcing plate it, as indicated at t in Figs. l, 4 When the pulley as thus assembledis secured on the shaft I by means of the key il, a binding screw il' will be screwed into engagement with the key, as usual. f

While I prefer to employ a hub having a hexagonal shape, any other non-circular shape of hub may be employed. 'I'hus in Figs. 8 and 1G,

4Il show a hub I8 generally circular in crosssection but provided with a flat side I9. When this shape of hub is used, the disc E and reenforcing plate -9 will have an opening of the same shape as the hub; that is, one side of the opening will be made flat to engage the flat Iside I9 of the hub when inserted on it. This shape of hub will have the circular projection I4 previously described, and the .pulley may be clamped to the hub by spinning the projection to cause it to be turnedI back to clamp or clinch the rear face of the pulley between itself and the shoulder I5 of the hub, as before.

Other means than that described, however, may be employed for securing the pulley on the hub. Thus, in Figs. 6 and 7 I have shown the projecting circular portion I4 as being screwthreaded,=as indicated at 2U, and having a bindl ing nut 2i screwed thereunto clamp the`disc .lI

and re-enforcing plate Ill between the nut and the shoulder I5 on the hub.

In practice, in the use of the preferred form of the invention, each dealer would be provided through half the thickness of the pulley andthe round portion to extend. through the other half.

The hexagonal, or other non-circular portion,-l'

bein-g larger in diameter than the round portion,

provides a shoulder, against which the rear disc. y of the pulley is clamped. This non-circular portion, co-operating with a like non-circular open-v v' ing in the frontdisc, also serves to afford a driving relationship between the hub and the pulley.

If both of these parts were4 round, the pulley would have a tendency to turn on` the hub inv stead of turning with it.

I claim: 1`

1. Agpulley assembly comprising a pulley havf. ing a central opening circular on one side of the'y pulley and non-circular on the other, la bored I hub having a' circular portion extending into i and projecting beyond said circular opening andv f a non-circular portion iitted in said non-circular opening, and means on the projectingY circular portion for clamping the pulley against said noncircular portion.y f y 'i 2. vA pulleyassembly comprisingapulley having a centralopening circular on one side ofv the '125- pulley, and an enlarged and non-circular opening on the other, abored hub having ar central circular portion inserted in and projecting beyond rsaid circular lopening and a non-circular portion tted in said non-circular opening and having a shoulder engaging the inner vportion of. the pulley surrounding saidcircular opening', and

means on the projecting circular portion for f l, clamping the pulley against said non-circular portion. I l

3. A pulley assembly comprising Va pulley formed of two vdiscs securedtogether. and presenting' a circumferential groove, one of said discs having a central circular opening and the. other a centralV non-circular opening, a bored hub having ay circular portioninserted intoand;

projecting beyond said circular opening andvr a niflaffg4 non-circular portion fittedy inv said non-.circular opening, and means on the projecting circular' portion for .clamping the pulley circular portion. 4. A pulley assembly comprising a pulley havagainst said noning a central opening circularon one'sid'e o f the I pulley and hexagonal on the other, a bored hub v havingfa circular portion extending intoA and projectingloeyond said .circular openingand a non-circular portion fitted in said non-circular opening, and means on the projecting circular portion for clamping the pulley against said noncircular portion.

5. A .pulleyy assembly comprising a` senting a circumferential groove, one of. saidy discs having a central circularopeningand thee' other acentral opening larger than said circularl opening and provided with a dat side, a bored. hub

having a reduced4 circular portion extending; into llllly] formed of two discs secured together and preand projectingbeyond said circular `opening and i a portion having a iiat side fitted into-said larger opening, and means on the projr-:ctingy circular portion for clamping vthe pulley against 'one-side of the hub.' t t 6. A pulley assemblyconsisting of twoianged I discs secured together and presenting a circular 'y circumferential groove, the rear disc having a round hole in its center and the front disc' having a larger hole in its center provided with at least one non-circulary portion, a bored hub-having portions presenting two cross-sectional shapes,` one portion to conform totheround opening in the rear disc and` projecting beyond-'fthe sarna` 1li. -I I l disc against the face of said hub.

and the other portion being larger in diameter and of a shape to conform to the opening in the front disc, whereby a driving relationship between the hub and pulley is secured, the project-` ing portion of said hub being spun back against the rear disc to clamp the pulley rrnly agains't the side of the larger portion of said hub.

7. A pulley assembly comprising a bored hub having an enlarged portion of non-,circular shape and a reduced circular portion projecting `centrally from one face of said enlarged portion, a pulley comprising two discs secured together, one having an opening in its central portion fitted on the non-circular portion of the hub and the other disc having a circular opening in its central portion receiving the circular projecting portion of said hub, the end of said projecting portion being turned backward to clamp the latter 8. A pulley assembly comprising a pulley having acentral opening extending through a part of its thickness and of one diameter, and a central opening extending through the balance of its thickness and of a smaller diameter, a hub inserted in said pulley having two corresponding lcross-sectional diameters providing a shoulder for abutting against that portion of the pulley having the smaller opening, one part of the central portion of the pulley having a non-circular portion engaging a corresponding non-circular portion of the hub, whereby to establish a driving relationship therewith, and means for securing the pulley against saidshoulder.

9. A pulley assembly comprising a pulley having a central opening extending through a part of its thickness and of one diameter, and a central opening extending through the balance of against said shoulder.

its thickness and of a smaller diameter, a hub inserted in said pulley havingtwo corresponding cross-sectional diameters providing a shoulder for abuttingl against that portion of thepulley ing a central opening extending throughy a partv ol its thickness and of one diameter, and a central opening extending through the balance of its thickness and of a smaller diameter, a hub inserted in said pulley having two corresponding cross-sectional diameters providing a shoulder for abutting against that portion of the pulley having the smaller opening, the central portion.

oi the pulley and a corresponding portion of the hub having a non-rotatable engagement to establish a driving relationship vbetween thetwo, and means for securing the pulley against said shoulder. o

l ll."A pulley assembly comprisingy a pulley havling a central opening extending through a part of its thickness and of onediameter, and a centrai opening extending through the balance of its lthickness and of a smaller diameter, a hub inserted in said pulley having two corresponding cross-sectional diameters 'providing a shoulder for abutting against that portion of the pulley having the smaller opening, the central portion of the pulley having non-rotatable engagement with the hub, and means for securing the pulley 35 QRVlLLE, 

